Variety 1-P-10: Heath Counterfeit Detectors varied from edition to edition, and noted Numismatist Eric P. Newman, whose collection this particular Counterfeit Detector is from, developed a classification system to compare and describe their variety. This particular variety is described as follows: Same as Variety 1-P-4 except for: TENTH THOUSAND on title page.
Front end paper: EPN classification note and description
Dakin, Davies, & Metcalf, Stereotypers and Printers, 37 Cornhill
A. Williams & Co.
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Internet Archive Python library 0.7.0
The only infallible method of detecting counterfeit, spurious, and altered bank-notes, and applicable to all banks in the United States and Canadas, as now in circulation, or that may be issued, with genuine bank-note designs, by the American Bank-Note Company, New York and Boston